Since gravitational waves are now on the tip of every astronomer’s tongue, today’s post looks back at a classic paper’s key result that is quintessential in the search for gravitational waves using pulsar timing arrays.

Sometimes a mystery can hide in apparently plain things. Astronomers have just discovered that a delta Scuti star known for over 40 years is actually something entirely different and full of peculiarities.
Image via M. Garlick/University of Warwick, ESA/Hubble.